The White House and the Department of Health and Human Services (HHS) solicited millions in donations from private health care companies for a nonprofit organization to promote Obamacare, according to the Government Accountability Office (GAO).

Health and Human Services Secretary Kathleen Sebelius spoke out on Sunday for the first time following the announcement that she would step down, and maintained that she alone decided to leave the post.

President Obama on Friday formally nominated Sylvia Mathews Burwell to head the Department of Health and Human Services (HHS) following the botched resignation of Kathleen Sebelius.

Burwell served in several positions under the Bill Clinton administration, including as a deputy aide to then-budget director Jack Lew. In July 1995, Burwell (then Sylvia Mathews) was one of several key aides questioned by the Senate Whitewater Committee regarding the death of deputy White House counsel Vince Foster.